public Block ReadBlock(long offset)
{
stream.Position = offset;
int count = reader.ReadInt16();
byte[] blockData = reader.ReadBytes(count * (keySize + valueSize));
Record[] records = new Record[count];
for (int i = 0, recordOffset = 0; i < count; i++, recordOffset += keySize + valueSize)
{
ByteArrayRef key = new ByteArrayRef(blockData, recordOffset, keySize);
ByteArrayRef value = new ByteArrayRef(blockData, recordOffset + keySize, valueSize);
Record record = new Record(key, value);
records[i] = record;
}
return new Block(records);
}
private int CompareKeys(ByteArrayRef keyA, ByteArrayRef keyB, int firstByte)
{
Contract.Assume(keyA.Length == keyB.Length, "Both keys should have the same size.");
for (int i = firstByte; i < keyA.Length; i++)
{
int diff = keyA.GetByteAt(i) - keyB.GetByteAt(i);
if (diff != 0)
{
return diff;
}
}
return 0;
}